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All Journal Jurnal Kebidanan Jurnal Penelitian dan Evaluasi Pendidikan Reaktor Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains AVERROUS: Jurnal Kedokteran dan Kesehatan Malikussaleh Unri Conference Series: Community Engagement Jurnal Kesehatan Amanah Al-'Adad: Jurnal Tadris Matematika Karakter: Jurnal Riset Ilmu Pendidikan Islam

Komalasari Komalasari

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Author-ID : 2900262

Religion Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Education Electrical & Electronics Engineering Energy Engineering Health Professions Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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MODEL KESETIMBAGAN ADSORPSI Zn+2 DENGAN KALOIN A. Fadli; Komalasari Komalasari; M. S. Amir; d R. Sari; R. Siburian
Reaktor Volume 08 No.2 Desember 2004
Publisher : Dept. of Chemical Engineering, Diponegoro University

Kaolin merupakan salah satu mineral yang d apat digunakan sebagai adsorben. Kaolin yang digunakan untuk menjerap logam berat Zinc (II) berasal dari Daerah Sincalang Provinsi Riau. Kaolin dihancurkan dan diayak hingga berukuran -200+240 mesh. Kaolin direndam dalam 0,1 M NaOH selama 24 jam. Kemudian kaolin dimasukkan ke dalam larutan Zinc (II) dan dianalisa menggunakan AAS (Atomic Absorption Spectrometer). Sampel diambil setiap 15 menit. Variabel yang dipelajari adalah temperatur antara 30˚C - 50˚C dan konsenttasi antara 40 - 120 ppm. Data adsorpsi dianalisa dengan model Freundlich and Langmulir yang diusulkan secara legresi linier. Dari hasil analisa diperoleh bahwa model Freundlich adalah model yang cocok untuk mendiskripkan mendiskripsikankesetimbangan adsorpsi. Dari model Freundlich diperoleh nilai konstanta kesetimbangan; K = 2.6503 pada temperatur 30 ˚C .Kapasitas Jerap (Q ) akan meningkat jika temperatur adsorpsi dinaikkan pada konsentrasi Zn (II) 120 ppm. Temperatur adsorpsi mempengaruhi secara signifikan kapasitas adsorpsi Kata kunci : Adsorpsi Zn (II); model; kesetimbangan;kaolin

INHIBITOR POLIFOSFAT UNTUK MENGENDALIKAN KOROSI PADA PIPA SISTEM PENDISTRIBUSIAN AIR Komalasari Komalasari; Zultiniar Zultiniar
Jurnal Sains dan Teknologi Vol 13, No 1 (2014): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Dalam proses industri sering terjadi masalah, salah satunya adalah adanya kebocoran/penipisan pada alat prosesproduksi yang disebabkan oleh korosi. Korosi merupakan proses kerusakan/degradasi pada material akibat berinteraksidengan lingkungan. Salah satu cara pencegahan korosi adalah dengan menambahkan inhibitor. Inhibitor adalah senyawakimia yang dapat mengendalikan atau memperlambat proses korosi. Polifosfat merupakan salah satu inhibitor yang baikuntuk mengendalikan laju korosi. Inhibitor polifosfat dapat mengurangi aktivitas proses korosi dan tidak menyebabkankerusakan pada material dan lingkungan. Penelitian ini bertujuan untuk mengetahui dan mempelajari pengaruh inhibitorpolifosfat dalam mengendalikan korosi pada pipa air, menghitung laju korosi yang terjadi pada bahan logam tanpainhibitor dan memakai inhibitor serta mengetahui jenis logam yang baik dan tahan korosi agar dapat digunakan padaalat proses industri. Penelitian ini dilakukan dengan cara merendam coupon corrosion (besi, stainless steel, danaluminium) selama 1 minggu di dalam larutan NaCl dengan berbagai konsentrasi yang berbeda (500, 5000, 15.000, dan30.000ppm), tanpa inhibitor dan dengan menggunakan inhibitor polifosfat dengan berbagai konsentrasi polifosfat (50,100, 200, 300, dan 400ppm). Hasil dari penelitian ini diperoleh untuk uji tanpa inhibitor bahwa semakin tinggikonsentrasi NaCl maka laju korosi semakin meningkat pada berbagai coupon korosi. Sedangkan untuk uji denganmemakai inhibitor polifosfat, laju korosi menurun sampai pada titik konsentrasi NaCl 300ppm pada berbagai couponkorosi. Laju korosi yang tertinggi diperoleh pada logam besi dibandingkan dengan aluminium dan stainless steel. Lajukorosi yang terendah terjadi pada stainless steel.Kata Kunci : Inhibitor, Inhibitor Polifosfat, Korosi

Menajemen Pendidikan dan Pelatihan Tindak Lanjut Uji Kompetensi Guru SD di LPMP Kalimantan Tengah Komalasari Komalasari
Jurnal Penelitian dan Evaluasi Pendidikan Vol 8, No 2 (2006)
Publisher : Graduate School, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/pep.v8i2.2007

Penelitian ini bertujuan untuk mengungkap: (1) perencanaan, (2) pengorganisasian, (3) pelaksananaan dan (4) pengawasan pada pendidikan dan pelatihan (diklat) tindak lanjut uji kompetensi guru SD di LPMP Kalimantan Tengah. Penelitian ini menggunakan pendekatan kualitatif. Data dikumpulkan melalui wawancara, dokumentasi dan observasi dengan melibatkan pengelola diklat, fasilitator, dan peserta diklat Keabsahan data diukur dengan cara: (a) trianggulasi, (b) perpanjang-an waktu pelaksanaan penelitian, (c) pengumpulan data secara terus menerus, (d) penggunakan data yang berlimpah, (e) pengecekan ulang, dan (f) tanya jawab dengan teman sejawat Analisis data menggunakan teknik yang diajukan oleh Miles dan Huberman (1994) yaitu: (a) reduksi data, (b) penyajian data, dan (c) verifikasL Hasil penelitian mengungkapkan bahwa: (1) perencanaan diklat belum optimal yang dilihat dari: (a) asesmen kebutuhan, (b) tujuan diklat, (c) kesesuaian program dengan waktu diklat, (d) waktu dan tempat pelaksanaan diklat, dan (e) dana yang tersedia; (2) pengorganisasian belum optimal dilihat dari pembagian kerja dengan jabaran tanggung jawab masing-masing unit; (3) Pelayanan non akademik diklat sudah optimal namun pelaksanaan pembelajaran belum optimal, yang dilihat dari: (a) standar jumlah peserta per kelas, (b) bidang kompetensi guru, (c) waktu, dan (d) kelengkapan bahan diklat; dan (4) pengawasan belum terlaksana dengan baik, dilihat dari pencapaian tujuan dan partisipasi peserta Kata kunci: pendidikan dan pelatihan, uji kompetensi, guru SD.

Pengaruh Konsentrasi H2so4 Terhadap Laju Korosi Dan Efisiensi Menggunakan Ekstrak Daun Salam (Syzgium Polyantha L) Paian Harianja; Komalasari Komalasari; Desi Heltina
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Corrosion cause a material has a limited lifespan,where teh material that was estimated for a long-term use turns out to had a shorter lifespan than its avreange lifespan. One of the prevention of the corrosion was to used corrosion inhibitors that made using organic material was Bay leaf (Syzgium Polyantha L) This research beginss with the manufacture of the bay leaf extract using maceration method for 6 days. The calculation method used in this study was a method of measured weight loss with inhibitor concentrations of bay leaf extract (2 gr/L), variations time were (24, 36, 48 and 60 hours) and corrosion media concentration H2SO4 ( 0.5 and 1 M). The highest inhibition efficiency in the addition of inhibitors 2 gr/L with corrosion media concentration H2SO4 0.5 M of time 60 hour was 70.370% Keywords: aluminium, bay leaf extract, corrosion inhibitor, corrosion rate

Pengaruh Temperatur Terhadap Kinetika Reaksi Pembentukan Hidroksiapatit (HAp) Dari Precipitated Calcium Carbonate (PCC) Cangkang Telur Itik Melalui Proses Presipitasi Hadrian Yonas Sebastian Napitupulu; Yelmida Azis; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Hydroxyapatite (Ca10(PO4)6(OH)2) is a calcium phosphate compound that has been widely used as a bone implant material due to its chemical composition is identical with natural bone. The aim of this research is to synthesized, characterized and studied the kinetics of hydroxyapatite synthesis reaction using PCC (Precipitated Calcium Carbonate) of duck egg shell by precipitation method. In this research the samples were taken every 10 minutes as much as 10 mL for 1 hour to determined the reaction kinetic. Then stirred for 24 hours with temperature variation (300C, 400C; 500C; 600C) and aged for 24 hours. The analysis of Ca concentration in filtrate was detected by using complexometri method. The synthesized hydroxyapatite was characterized by XRD and obtained a hexagonal crystalline structure with crystal size between 20 - 37 nm. The reactions kinetics of synthesized hydroxyapatite follows the pseudo first order equation with the value of reaction rate constant (k) is 0,0543 min-1; 0.0759 minutes-1; 0.1146 minutes-1; and 0.1597 minutes-1.Keywords: hydroxyapatite, reaction kinetics, PCC, duck egg shell, precipitation

Pembuatan Bahan Bakar Padat Dari Pelepah Sawit Dengan Menggunakan Gliserol Sebagai Perekat Firman Tampubolon; Zuchra Helwani; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Biomass is currently the largest renewable energy source globally and economically and also an environmentally friendly energy source. One of the potential agricultural wastes that can be used as an alternative fuel is oil palm fronds. The heating value of oil palm fronds is 17.200 kJ/kg. The heating value can be improved by conducting carbonization process followed by densification. With carbonization the smoke forming elements can be minimized, so that the exhaust gas is cleaner. Biomass densification aims to increase density and reduce handling problems such as storage and transportation. The heat value can be increased again by adding an adhesive in the form of glycerol which has a heating value 25.175 kJ/kg. The aim of this study is to produce a solid fuel from oil palm fronds by using carbonization process and to know the characteristics of products. This study aims to produce solid fuel using the densification process of oil palm fronds carbon obtained from the carbonization process, knowing the effect of adhesive composition and compacting pressure in the manufacture of products and knowing the heating value of the products produced. The particle size used where 20 mesh and the adhesive composition used where 90:10, 80:20 and 70:30 %wt. Compacting pressure used where 50, 75 and 100 bar. Data processing in this study was obtained by proximate analysis, density, and using a bomb calorimeter. The highest heating value obtained was 24.604 kJ/kg from the briquette product with the adhesive composition 70:30 and the compacting pressure 50 bar. While for the lowest heating value obtained at 20.693 kJ/kg on briquettes which adhesive composition 90:10 and compacting pressure 100 bar. Process conditions that have a significant effect on heating value are adhesive compositions and compacting pressures.Keywords: densification, glycerol, carbonization, heating value, oil palm fronds

Pemanfaatan Ekstrak Daun Ketapang (Terminalia Catappa L) Sebagai Green Inhibitor Dengan Metode Maserasi Untuk Mengendalikan Laju Korosi Pada Aluminium Roin Nuretha; Komalasari Komalasari; Sri Rezeki Muria
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Terminalia catappa L leaf extract has a considerable influence in decreasing the corrosion rate of a metal, because it contains tannin compounds which can be used as corrosion inhibitors. The purpose of this study was to determine the effect of addition of Terminalia catappa L leaf extract inhibitors on the corrosion rate of aluminum with variations in immersion time and determine the inhibition efficiency of variations in the concentration of Terminalia catappa L leaf extract on aluminum in corrosive media. The parameters varied in this study were the immersion time of the maceration process, the inhibitor concentration added in the corrosive solution of sodium chloride, namely 0, 1,5 and 2 g/L as well as variations in the time of corrosion testing at 36, 48, 60 and 72 hours. The time of maceration process shows that the longer the contact time, the greater the concentration of crude tannin, while the time of immersion of aluminum shows the longer the immersion time, the corrosion rate tends to decrease with the addition of inhibitors and the higher the value of inhibitory efficiency. The best crude tannin concentration was obtained during the maceration process for 6 days with a crude tannin concentration of 84,90 mg / L. The lowest corrosion rate was obtained when the addition of 2 g / L inhibitor in the corrosive NaCl medium with immersion time of 72 hours was 0,347 mm / year. The results showed that the best inhibition efficiency value using ketapang leaf extract inhibitor was added to the inhibitor 2 gr / L in 0,5 M corrosive media soaked for 72 hours with an efficiency value of 90,00%. Keywords: aluminum, corrosion rate, inhibitors, maceration, Terminalia catappa L leaf

Sintesis Komposit Fe3O4/Hidroksiapatit Menggunakan Metode Presipitasi Dengan Variasi Rasio Ca/P Dan Kecepatan Pengadukan Adha Widoni; Ahmad Fadli; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Fe3O4/Hydroxyapatite composite can be applied in the biomedical field especially for drug delivery systems. The purpose of this research was to determine the effect of Ca/P ratio and stirring rate for the composite magnetite/hydroxyapatite characteristic. Synthesis of Fe3O4/Hydroxyapatite composites using the precipitation method. Variation of Ca/P ratio 0.67; 1.67; 2.67 and stirring rate of 400 rpm, 600 rpm, 800 rpm. 20.35 mmol (NH4)2HPO4 solution with 150 ml was added to mixed the magnetite suspension and 34 mmol Ca(NO3)2.4H2O solution. NH4OH was added to the solution until pH 11 and then, the suspension was aged for one day. The magnetic suspension was washed with distillate water until pH neutral. The precipitate was dried and sintered at temperature 400˚C until composite powder obtained. Composite powder was characterized by X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). Increasing of Ca/P ratio from 0.67 to 1.67 increased the crystal size and crystallinity of the composite, then decreased the size of the crystal and crystallinity at the Ca/P ratio 2.67. Crystallinity is obtained at 75.47% - 81.77%. While the effect of stirring rate from 400 rpm to 600 rpm increased the crystal size from 20.75 nm to 25.23 nm, Then, decreased at stirring rate of 800 rpm by 21.68 nm. Fe3O4/Hydroxyapatite composite were superparamagnetic with saturation magnetization (Ms) 11.97 emu/gr. Keywords: Drug Delivery, Hydroxyapatite, Magnetite, Magnetic Properties

Hidrolisis Daun Sawit Menjadi Glukosa Dengan Menggunakan Katalis H3PO4-H2SO4 Fitriyanti Fitriyanti; Komalasari Komalasari; Sri Rezeki Muria
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Glucose is a simple monosaccharide containing an aldehyde group and six carbon atoms. Glucose is an intermediate product in biological and chemical conversion. Glucose can made from hydrolysis of biomass such as oil palm leaves. Previously, oil palm leaves are only used as fertilizer and animal feed. Biomass with the main component cellulose is very resistant to hydrolysis by water, therefor a catalyst in the form of acidic or alcalyc is needed. The purpose of this study was intended to examine the use of oil palm leaves as a raw material in the manufacture of glucose. There are two stages in this research, pretreatment and hydrolysis. The pretreatment using acid solvents with low concentrations of 0,5% H2SO4 with the cooking process at 80°C for 1 hour reaction time. The results showed that the acid pretreatment process using 0,5% H2SO4 solvent was able to increase cellulose 2%, hemicellulose 1%, and lignin reduction by 1%. The hydrolysis process is carried out in two stages, first stage is immersion of oil palm leaves with an H3PO4-H2SO4 catalyst ratio of 70:30 for 16 hours at room temperature. Then the second step is adding distilled water and cooked at a temperature variation of 100°C, 120°C and takes 2 hours, 3 hours and 4 hours. The highest glucose yield obtained from the hydrolysis process at 100°C for 4 hours at 26,8376% and the lowest glucose yield obtained from the hydrolysis process at 120°C for 4 hours at 18,1812%Keywords : Glucose, hydrolysis, oil palm leaves

Prarancangan Pabrik Etilen Dari Cracking Nafta Menggunakan Proses Maxene Dengan Disain Alat Utama Menara Absorbsi Wet Scrubber Farhan Hidayatullah; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The design of an ethylene plant from cracking naphtha using the MaxEne process aims to assess the feasibility of the plant for establishment. The ethylene plant is designed with a capacity of 155,000 tons/year. Naphtha, which is the main raw material for obtaining products ethylene according to capacity and the production process used is MaxEne where The MaxEne unit is a new and innovative process for optimizing naphtha steam cracker operations and catalytic reform. The main product of ethylene is obtained through separation using a absorption tower wet scrubber with an operating condition of 60 oC at a pressure of 5 bar where the bottom product is H2S separated from cracked gas at top product which is including ethylene in it. This factory is planned to be established in 2023 near Pertamina RU II Dumai, Riau. Based on the results of economic analysis and factory feasibility, Cumulative Cash Ratio (CCR) is 2,2, a pay back period is 3,46 years and a rate of return on investment (ROROI) of 34,4% for non-discounted techniques. Based on the results of economic analysis, the pre-design of the ethylene plant with a capacity of 155,000 tons/year is feasible to consider its establishment. Keywords: Ethylene, Naphtha, MaxEne, Absorption Tower, Analysis Economic

Co-Authors A. Fadli Abdul Hafiz Hidayat Abdul Rahman Marwis Karim Abdullah Agung Hayyuka Adela Shofia Addabsi Adha Widoni Agung Prabowo Ahmad Fadli Al Qarni Putra Amun Amri Astri Gusrita Asyraful Akbar Ayu Annisya Tri Adriana Boy Jansen Roberto Manik d R. Sari Dani Pradana Desi Heltina Dhamala Shobita Chandra Dimas Nofriyan Drastinawati Drastinawati Edy Saputra Eferius Mendrofa Evelyn Evelyn Fachry Abda El Rahman Fadhila Ulfa Farhan Hidayatullah Farida Farida Fauzia Mulyana Fikri Miftahul Shiddiq Firman Tampubolon fitriyanti fitriyanti Getra Anugrah Hadrian Yonas Sebastian Napitupulu Harfiah Faradila Ian Desi Rosalina Situmeang Ida Zahrina Ilham Habib Ines Indriyani Jimmy Anderson Kartono Kartono Kendro Prasetyo M. S. Amir Mardianti Mardianti Mastiar Krisdayanti Sinaga Muhammad Alfin Khairullah Muhammad Khairil Amri Muhammad Rivaldiansyah Mustika Canra Oding Sitorus Paian Harianja Primadevi, Inggit Putri Rahmadani Qurotullaili Qurotullaili Rahmat Ilham Rajuddin Rajuddin rima siburian Rina Maryenti Riona Sanjaya Roin Nuretha Rozanna Sri Irianty Roziana Roziana Saefudin Zuhri Siska Siska Siti Chotijah Sri Rezeki Muria Sry Utami Pardede Syelvia Putri Utami Teuku Azhari Hassan Tubagus Maruf Ansori Vina Sutratul Putri Viona Aulia Rahmi Wahyu Hidayat Yelmida Azis Zuchra Helwani Zultiniar Zultiniar

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